Common Internet Error Messages
When you're browsing the Web, whether by clicking hyperlinks, typing addresses in the Internet Explorer Address bar, or clicking an icon in your Favorites folder, you might not be able to get to the site you want. Instead, you'll see a Web page with a message and usually a number. Here's an explanation of the most common numbers and messages.
403 Forbidden/Access Denied
The Web site you requested requires special access permission, such as a password.
404 Not Found
The browser found the host computer, but did not find the specific document you requested.
To resolve this, make sure you typed the correct address. The page may have been removed from the site, had the name changed, or been moved to a new location.
You might also try retyping the address but leaving off the file name. For example, if you were unable to find //www.microsoft.com/ie/sample.htm, try typing just //www.microsoft.com/ie/ to go one level up on the Web site.
503 Service Unavailable
The server for this Web site is too busy.
To resolve this, try viewing the page again after 30 seconds or so.
Bad file request:
An online form or the HTML code for an online form has an error.
Connection refused by host
This is a version of the 403 Forbidden error. The Web site you requested requires special access permission, such as a password.
Failed DNS lookup -
The Web site's URL couldn't be translated into a valid IP address. This error is common on commercial sites because the computers responsible for translating the IP addresses are overloaded. Typing the wrong address can also cause this.
To resolve this, retype the address, or try again later when Internet traffic might not be as busy.
Helper application not found
You have attempted to download a file that needs a helper application, and Internet Explorer can't find it.
To resolve this, click the View menu, and then click Options. Click the File Types tab, and make sure the correct directory and file name are entered for the helper application. If you do not have a helper application, you can save the file to disk, and then obtain the helper application.
Not found
The page that the hyperlink points to no longer exists.
Site unavailable
Too many users are trying to access the site, the site is down for maintenance, there is "noise" on the line, or the site no longer exists. Typing the wrong address can also cause this.